<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>名片制作</title>
    <style>
        .u{
            width: 1300px;
            height: 1400px;
            background-image: url(../img/bs1.png);
            margin: 100px auto;
            position: relative;
        }
        .u.left{
             position: absolute;
            left: 0;
            bottom: 0;
            border-style: solid;
            border-width: 80px 150px;
            border-color: transparent transparent white white;

        }
        .u.right{
            position: absolute;
            right: -900px;
            bottom: 0;
            opacity: 0;
            border-style: solid;
            border-width: 80px 150px;
            border-color: transparent #008282 #008282 transparent;
            transition: all 1s linear;
        }

    </style>
</head>
<body>
    <div class="u">
        <div class="left"></div>
        <div class="right"></div>
    </div>
</body>
</html>